Research on Uniaxial Compression Mechanics of Diorite under Flowing Acidic Solution Scouring

Wei, Chen; Wu, Li; Zhang, Zhi; Wan, Wen; Liu, Jie; Wu, Xiaofan; Peng, Wenqing; Zeng, Xian‐Tao; Ren, Zhenhua; Xie, Shengrong; Zhou, Yu

doi:10.3390/min12060770

Cited by 2 publications

(1 citation statement)

References 45 publications

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“…During the static acid etching, the pH value of each solution and the weight of the samples were continuously measured by pH meter and electronic balance when the concentration of some cations in the immersion solution was monitored. In addition, the mechanical properties and failure characteristics of lamprophyre under uniaxial loading were studied [ 28 , 29 ]. Based on the above data, the acidification mechanism of lamprophyre was analyzed.…”

Section: Methodsmentioning

confidence: 99%

Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre

Guo

Feng

et al. 2022

Materials

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In order to study the weakening mechanism and mechanical behaviors of hard lamprophyre of Carboniferous Permian coal-bearing strata in China’s mining area, lamprophyre samples were subjected to static rock dissolution experiments with pH values of 0, 2, and 4. The acid corrosion mechanism of lamprophyre was revealed from the weight changes of samples, characteristics of solution ion concentration, and macro-mechanical properties. The experimental results show that reaction occurred between lamprophyre and acid solution. With the increasing concentration of H+, the reaction was more intense, the degree of acid etching was higher, and the weight loss was greater. The internal damage induced by acid etching results in the slow extension of the compaction stage of stress–strain curve of uniaxial compression, and the obvious deterioration of mechanical properties of the lamprophyre. The uniaxial compressive strength of the lamprophyre in the dry state is 132 MPa, which decreased to 39 MPa under the acid etching condition, showing significant mudding characteristics. Dolomite (CaMg(CO3)2 with 19.63%) and orthoclase (KAlSi3O8 with 31.4%) in lamprophyre are the major minerals constituents involved in acidification reaction. Photomicrograph recorded from SEM studies reveals that the dissolution effect was directly related to the concentration of H+ in the solution. The dissolution effect was from the surface to the inside. The small dissolution pores became larger and continuously expanded, then finally formed a skeleton structure dominated by quartz. The content of K+, Ca2+, and Mg2+ in the solution after acid etching reaction indicates that the acidified product of orthoclase is colloidal H2SiO3, which adhered to the surface of samples during acid etching and hinders the further acidification of minerals. The dissolution of dolomite and orthoclase under acidic conditions directly leads to the damage of their structure and further promotes the water–rock interaction, which is the fundamental reason for the weakening of the mechanical properties of lamprophyre.

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Section: Methodsmentioning

confidence: 99%

Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre

Guo

Feng

et al. 2022

Materials

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Effect Mechanism of Material Ratio on Ultrasonic P-wave Velocity in Coal Based Paste Fill Materials

An,

Song,

Ren

et al. 2024

Applied Sciences

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This research is designed to investigate the variations in ultrasonic p-wave velocity in various coal based paste fill materials used for recovering standing pillars in closed/closing coal mines, with consideration given to the effects of numerous material-related factors. For this purpose, orthogonal tests were designed. The evaluation was performed on the effects of four variables on the ultrasonic p-wave velocities in samples, using coal grains as the primary material. These variables consisted of the coal grains’ particle size (PA), high-water material content (PB), cement content (PC), and water content (PD). The experimental results show the following: (1) Ultrasonic p-wave velocity of coal based paste fill materials are measured within the range of 1.596 to 2.357 km/s, and these are classified (in descending order) as PD, PB, PC, and then PA, based on their effects on ultrasonic p-wave velocity. (2) Ultrasonic p-wave velocity is positively correlated with compressive strength and shear strength; the correlation coefficients are 0.82 and 0.69, respectively. (3) Changes in the ultrasonic p-wave velocity of coal based paste fill materials, when exposed to various factors, have been characterized by fitted formulae. It was observed that the velocity maintained a quadratic polynomial correlation with factor PB and exponential correlations with factors PA, PC, and PD. The comprehensive predictive model, reflecting the characteristics of the ultrasonic p-wave velocity in response to the combined influence of these four factors, was developed through the utilization of fitted equations pertaining to individual factor variations. Subsequently, this model underwent verification.

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Research on Uniaxial Compression Mechanics of Diorite under Flowing Acidic Solution Scouring

Cited by 2 publications

References 45 publications

Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre

Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre

Effect Mechanism of Material Ratio on Ultrasonic P-wave Velocity in Coal Based Paste Fill Materials

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